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My name is***** and I'll try to help you as best as I can. The dental procedure could not have caused damage to your salivary gland. But, it is possible the root canal can be failing. Usually, the type of discomfort you will feel is pressure at the end of the root or all the way down in your jaw. You can be mistaking this for floor of the mouth pain or jaw pain. I would have your dentist take an x-ray and do some tests on the area to see if this is the case. Dry mouth can be caused by many different things, the most frequent being medications.
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